Todd Lipcon from Cloudera introduces the concepts behind open source, distributed, non relational databases, from the recent NOSQL meetup in San Francisco. He presented a summary of many of the issues that people are trying to solve with these systems:
*Partitioning schemes (does maintaining a map really not scale?)
*Data models
*Consistency models
*Conflict resolution
*Storage layout
*Cluster state management
*API (get, set, delete, multi-get)
*Automated recovery
*Performance
Resources